He will team up with presenter Eamonn Holmes on a celebrity version of the show screened on ITV tomorrow, nine years after the pair first joined together to take part in the programme.
Also lined up to appear are former Westlife star Kian Egan and Olympic medallist Rebecca Adlington, both recently contestants on I'm A Celebrity ... Get Me Out Of Here! and former Countdown star Carol Vorderman who is paired with actress Caroline Quentin.
The Christmas special edition of Who Wants To Be A Millionaire? is to be screened by ITV at 9pm on Thursday.